Edge trimmer for shoe soles



NOV. 26, 1929. c, BAMMER 1,737,351

EDGE TRIMMER FOR SHOE SOLES' Filed Jan. 11, 1928 1 mmmer Patented Nov. 26, 1929 CARL r. BAMMER, OF v'n iiton; enticemennen TRIMMER FOR stior. semis Application filed January ii, 1928. Serial nofz r s'eie This invention relates to shoe finishing machines and has for an object the provision of a quick-change plate whereby the trimming knives customarily used on shoe finishing machines may be changed much more the said drawings and description, as I may adopt variations-of the preferred form within the scope of my invention as set forth inthe claims. v Referring to the drawings wherein similar reference characters denotev similar parts throughout Y I Figure 1' is a longitudinal, sectional View of a trimming knife held in position upon its mandrel by one of the improvedquickchange plates of my invention.

Figure 2 is a side elevation of theplate of Figure 1.

Figure 3is a front elevation of of Figure 1.

Figure 4 is a sectional view similar to Figure 1, but showing a modification of my quickchange plate.

Figure 5 is a side elevation of the plate of Figure 4.

Figure 6 is a Figure 4.

Figure 7 is a sectional view similar to Figure 1, but showing another modification of my quick-change plate.

the plate All of the embodiments of the improved quick-change plate of my invention shown Figure 8 is a front elevation of the plate:

in the drawings and described herein are intended for use to removably retain a cutting knife 11 0f the type ordinarily used for triniing shoe soles-and heelsy against a shoulder 12 upon a collar 13 which is slidabl-y mounted upon the mandrel or main shaft14 of a shoe finishing machine, A sp ring gm under tension betwecn a portion of the collar lgfand a collar 17 rigid with the shaft 14-;urges the collar 13 and itsshoulder lg toward the end o the haf aedap ura ity pf nae integralwith the shoulder 12;- are adapted to extend between the plates; 19 of the knife 11 as clearly shown in- Figures 1 4 and 7. v

The parts so far described are purely con- "entienal n n e -aim. is a 't the n velty, bu h e nt fe u f, my .i ven ib are incorporatedjin thej quiek-change plate indicated in its entirety at 21.; q 7

In the embodimentshown lfiiEiQilhQs 11, 2

and 3theplate 21 comprisejs a threaded portion 22 for the receptiofn'of whichjthe end of the shaft 14 is drilled centrally and threaded as at- 28. comple'mentarily to thethreaded portion22'.- An enlarged head- 2-4 is'provided upon the end of the threaded portion 22; the diameterof this headpireferablyba ing larger than'the diameter of the kiiife 11' so thata-guiding shoulder 26 isprovided to assist in properly holdingthe shoe sole or other article being trim-med against the revolving trimming; knife 11.- An annular shoulder 27 upjon-theyinner face ofthehead 24 is adapted to enter the central aperture 28 of the cutting knife 11 to retain-the' two in concentric alignment? and an annular shoulder 29 1011 the'outer face-of; the head 24 is provided witli kn11rling- ,31 to permit the 7 quick-change plate to be positioned and refront elevation of the plate of moved without the use of any tools.-

YVh'ile the operation of trimming shoe soles is being carried out itis frequently necessary to; chafnge the cutterll f oronfeof different s ns, W enimp ov d q i kc a g p at i .emr oyi'ed fo r taining; th cutter 11 in position uponits mandrel 14 this substitution of" cutters 11 may be carried out wi e-u mo t xped t n s ply y P at n h v l-m of one h a in the k r shoulder 29 and turning. the plate 21 the proper direction to remove the threaded portion 22 from the threaded portion 23 of the mandrel. The knife 11 may then be slipped from-the end of the shaft and replaced byunder considerable pressure of time which will make the employment of my quickchangeplate especially desirable.

In Figures 4, 5 and 6 a modification of my quick-change plate is shown. The head 36 is provided with a central aperture 37 which is threaded to be received upon the outer end 38 of a screw 39. The inner end 41 of the screw 39 is of smaller diameter than the outer end 38 and is threaded with preferably the conventional threads to 'make it receivable within the threaded bore 23 of the mandrel 14. When this embodiment is used it is intended that the screw'39 shall be positioned in the bore 23 of the mandrel 14 first, a screw driver slot 42 being provided in the outer end of the screw 39 for this purpose. Vhen the screw 39 has been so positioned the head 36 may readily be attached or detached therefrom in precisely the same way as that em ployed when operating the embodiment previously described.

In Figures 7 and 8 another modification is 1 shown in which the head 46 is provided with a smaller threaded central aperture 47. A

jscrew 48l1aving the same size threads moved therefrom in the same manner as that throughout itslength is intended to be in-- serted into the threadedaperture 23 of the j mandrel 14, after which the head 46 may be expeditiously positioned thereon and redescribed in connection-with the other embodiments. 1

-I claim: p

.1. In combination with a shoe finishing machine having a revoluble mandrel with a shoulder adjacent one end thereof, a trimming knife upon said end, a quick-change plate bearing against the outer face of said trimming knife, a threaded. shank integral with said plate, and a complementarily I threaded axial socket in said mandrel whereby said plate mayoptionally be locked against bearing against the outer face of said trimming knife, a threaded shank on said plate, 7

and a complementarily threaded socket in. said mandrel whereby said plate may optionally be locked against said knife .or displaced therefrom to permit removal of said knife.

3. In combination with a shoe finishing machine having a revoluble mandrel, a trimming knife removably mounted on said mandrel adjacent an end thereof, a quick-change plate bearing against the outer face of said knife, a'headless screw threaded into a coinplementarily threaded socket in said end of the mandrel and removably retaining the plate in position, said plate being removable from and positionable upon said mandrel by being grasped by the hand of the operator and turned in respect to said mandrel.

l. In combination with a shoe finishing machine having a revoluble mandrel with a shoulder adjacent one end thereof, a trimming knife having an aperture therethrough to permit placing upon said end, a quick-change plate bearing against the outer face of said trimming knife, an annular shoulder on the inner face of said plate entering the aperture in said knife, a knurled shoulder on the outer face of said plate, a threaded shank carrying said plate, and a complementarily threaded axial socket in said mandrel whereby said plate may optionally be locked against said knife or displaced therefrom to permit removal of said knife.

5. In combination with a shoe finishing machine having a revoluble mandrel with a shoulder adjacent one end thereof, a trimming knife'having an aperture therethrough to permit placing upon said end, a quickchange plateof larger diameter than said knife and bearing against the outer face thereof, an annular shoulder on the inner face of said plate entering the aperture in said knife, a threaded shank integral with said plate, and a complementarily threaded socket in said mandrel whereby said plate may optionally be locked against said knife or displaced therefrom to permit removal of said knife.

In testimony whereof I have signed my name to this specification.

CARL P. BAMMER.

said knife or displaced therefrom to permit removal of said'knife.

2. In combination with a shoe finishing machine having a revoluble mandrel with a shoulder adjacent one. end thereof, a trimming "knife'upon' said end, a quick-change plate 

